CN203911481U - Building block heat overlap type active electric power filtering device - Google Patents

Building block heat overlap type active electric power filtering device Download PDF

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Publication number
CN203911481U
CN203911481U CN201420314084.1U CN201420314084U CN203911481U CN 203911481 U CN203911481 U CN 203911481U CN 201420314084 U CN201420314084 U CN 201420314084U CN 203911481 U CN203911481 U CN 203911481U
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China
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type active
active electric
building blocks
electric filter
bridging type
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CN201420314084.1U
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Inventor
刘悦
程新德
杨建武
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SHANDONG LUYE RELIABLE ELECTRIC AUTOMATION CO Ltd
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SHANDONG LUYE RELIABLE ELECTRIC AUTOMATION CO Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20Active power filtering [APF]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

Disclosed is a building block heat overlap type active electric power filtering device. The device comprises a controller, an IGBT power module, a reactor, a contactor, an electrolytic capacitor, a resistor, an isolation transformer, a DC power supply, a high frequency filter, a ventilation heat radiation unit, a fuse, a lightning arrester, a sub-breaker, and a connector. A plurality of building block heat overlap type active electric power filtering devices can be in parallel connection through RS485 cables, utilizing the heat overlap manner. The building block heat overlap type active electric power filtering device is disposed in a three-phase AC power supply line of a load. The main breaker is connected to the three-phase AC power supply line of the load, and a current transformer accessed to the electric network collects a three-phase current signal at the load side, so that harmonic wave of a power supply of the load is effectively filtered, and the building block heat overlap type active electric power filtering device achieves the functions of compensating reactive power and correcting three-phase unbalance.

Description

The hot bridging type active electric filter device of a kind of building blocks
Technical field
The utility model relates to a kind of filtering harmonic device, specifically the hot bridging type active electric filter device of a kind of building blocks for low-voltage distribution system.
Background technology
Electric energy is the main energy sources of modern society, in all trades and professions, has a wide range of applications, and the quality of the quality of power supply is directly connected to national economy overall benefit.Along with power electronic equipment and extensive use non-linear, impact equipment, they take non-sinusoidal current from electrical network, even if what power supply was supplied with to these loads is sine-shaped voltage, but because they have its electric current not along with the synchronous nonlinear voltage-current characteristic changing of voltage, the electric current right and wrong that make to flow through electrical network are sine-shaped, this current waveform is by first-harmonic and humorous wave component, causes line voltage serious distortion.Harmonic wave makes the production of electric energy, transmission and the Efficiency Decreasing utilizing, affect the normal work of various electric equipments: harmonic wave makes motor produce supplementary load loss simultaneously, cause mechanical oscillation, noise, make transformer part seriously overheated, make the apparatus overheats such as capacitor, cable, ageing of insulation, shorten useful life, even breaks down or burn.Harmonic wave can cause the local parallel resonance of electric power system or series resonance, and harmonic content is amplified, and causes the electric equipments such as capacitor to burn.Harmonic wave also can cause relaying protection and automatics misoperation, and electric energy metrical is caused confusion.Outside for electric power system, harmonic wave can produce severe jamming to communication equipment and electronic equipment, and oneself becomes the major obstacles that hinders Development of Power Electronic Technology the harmonic pollution that power electronic equipment produces.
The mode of existing inhibition harmonic wave mainly adopts passive filtering mode, and it is formed through appropriately combined by power capacitor, reactor and resistance, utilizes the resonance principle of circuit, and certain harmonic wave is formed to low impedance path, thereby reaches the object of filtering harmonic wave.
Above-mentioned passive filtering mode suppresses that harmonic structure is simple, efficiency is high, small investment, operation maintenance are convenient, but its filtering characteristic depends on electrical network and load parameter, inductance, capacitance parameter drift can cause the change of filtering characteristic, and several subharmonic that can only suppress to fix, its volume is large simultaneously, there is overload problem, easy and electrical network generation resonance.
Existing Active Power Filter-APF detects load current by current transformer, and calculate by inner DSP, extract the harmonic components in load current, by pwm signal, send to inner IGBT module controls inverter to produce one and load harmonic current equal and opposite in direction, the harmonic current injection of opposite direction is in electrical network, reach the object of filtering, but its capacity is little, can only meets offset current situation hour.
Utility model content
The purpose of this utility model is to provide a kind of building blocks for low-voltage distribution system hot bridging type active electric filter device, it is arranged in the three-phase ac power cord road of load can carry out effective filtering harmonic wave to the power supply of load, and the function that has compensating power and proofread and correct three-phase imbalance.
The technical scheme in the invention for solving the technical problem is: the hot bridging type active electric filter device of a kind of building blocks, it is connected with the three-phase alternating current electrical network of load by main breaker, by sample load current carry out filtering harmonic wave of the current signal detecting device of access electrical network, it is characterized in that: the hot bridging type active electric filter device of building blocks adopts hot overlapping mode and the hot bridging type active electric filter device of other same building blocks to carry out a plurality of being connected in parallel, and by RS485 cable, interconnect between the hot bridging type active electric filter device of all building blocks.
The hot bridging type active electric filter device of described building blocks comprises controller, IGBT power model, reactor, contactor, electrolytic capacitor, resistor, isolating transformer, DC power supply and sub-circuit breaker, the signal input part of described controller is connected with the output of current signal detecting device, signal output part is connected with the control end of IGBT power model, described IGBT power model is connected with contactor by reactor, described contactor is connected with the main breaker of access electrical network by sub-circuit breaker, described electrolytic capacitor and IGBT power model are connected in parallel, described resistor is connected in parallel on contactor two ends, the input side of described isolating transformer is by sub-circuit breaker access electrical network, and outlet side is connected with the input of DC power supply, and the output of described DC power supply is connected with controller, described IGBT power model is two IGBT power models that are connected in parallel, and the control end of two described IGBT power models that are connected in parallel is connected with controller respectively.
Preferably, described current signal detecting device comprises current transformer.
Preferably, described controller comprises main control unit, PWM drive circuit, touch-screen and RS485 interface circuit, described main control unit adopts dsp processor, the signal input part of dsp processor is connected with the output of current signal detecting device, signal output part is connected with the control end of described two the IGBT power models that are connected in parallel by PWM drive circuit respectively, and described touch-screen is connected with dsp processor respectively with RS485 interface circuit.
Further, the hot bridging type active electric filter device of described building blocks also comprises the high frequency filter being arranged between contactor and sub-circuit breaker, described high frequency filter comprises 3 reactors, 3 capacitors and 3 resistors, 3 described reactors are connected on respectively in three-phase electricity circuit, one end Y-connection of 3 described resistors, the other end is connected in three-phase electricity circuit after 3 reactors through 3 described capacitors respectively.
Further, the hot bridging type active electric filter device of described building blocks also comprises the ventilation heat abstractor being arranged in ventilation and heat non-resistance passage, and the power line of described ventilation heat abstractor is connected with isolating transformer outlet side by fuse.
Further, the hot bridging type active electric filter device of described building blocks also comprises lightning arrester, and described lightning arrester is by sub-circuit breaker access electrical network.
Further, the hot bridging type active electric filter device of described building blocks also comprises connector, and described controller is connected with current signal detecting device by connector.
The beneficial effects of the utility model are:
1, the utility model has been realized the active filtering to mains by harmonics, and 50 following harmonic waves of filtering simultaneously, can also arrange by parameter the harmonic wave of filtering fixed number of times.The utility model is integrated simultaneously dynamic passive compensation and correction three-phase imbalance function, realized the comprehensive regulation of low voltage electric network.
2, the utility model has been realized the cordwood system type heat overlap joint of active electric filter device, can be according to site environment and operating condition, the exclusive building blocks combination of flexible customization, and realize charged direct change access way and assembly dilatation, it is safer, simple, convenient to safeguard, change, debug.
3, the utility model adopts cordwood system type ventilation and heat non-resistance passage, and perfection has solved the heat dissipation problem of conventional package active filter, the maintenance of the device of being more convenient for, maintenance and capacity allotment, and security performance significantly improves.
4, the utility model adopts two IGBT power model structures, and controller adopts ripple cancellation techniques, high frequency ripple that can effectively filtering inverter bridge generation itself, and current tracking speed is fast, and ripple is few, and loss is low.
5, the utility model, by the parallel running of the hot bridging type active electric filter device of a plurality of building blocks, has met the demand of various compensation capacities.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of the hot bridging type active electric filter device of building blocks described in the utility model;
In figure: 1 load, 2 current transformers, the hot bridging type active electric filter device of 3 building blocks, 301 controllers, 3011 main control units, 3012 PWM drive circuits, 3013 touch-screens, 3014 RS485 interface circuits, 302 IGBT power models, 303 reactors, 304 contactors, 305 electrolytic capacitors, 306 resistors, 307 isolating transformers, 308 DC power supply, 309 high frequency filters, 310 ventilation heat abstractors, 311 fuses, 312 lightning arresters, 313 sub-circuit breakers, 314 connectors, 4 main breakers, 5 RS485 cables.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the hot bridging type active electric filter device 3 of a kind of building blocks of the present utility model, it is connected with the three-phase alternating current electrical network of load 1 by main breaker 4, by sample load current carry out filtering harmonic wave of the current transformer 2 of access electrical network; The hot bridging type active electric filter device 3 of building blocks can adopt hot overlapping mode, carry out a plurality of being connected in parallel with the hot bridging type active electric filter device 3 of other same building blocks, and by RS485 cable 5, interconnect between the hot bridging type active electric filter device 3 of all building blocks.
As shown in Figure 2, the hot bridging type active electric filter device 3 of building blocks described in the utility model comprises controller 301, IGBT power model 302, reactor 303, contactor 304, electrolytic capacitor 305, resistor 306, isolating transformer 307, DC power supply 308, high frequency filter 309, ventilation heat abstractor 310, fuse 311, lightning arrester 312, sub-circuit breaker 313 and connector 314, described controller 301 comprises main control unit 3011, PWM drive circuit 3012, touch-screen 3013 and RS485 interface circuit 3014, described main control unit 3011 adopts dsp processor, the signal input part of dsp processor is connected with the output of current transformer 2 by connector 314, signal output part is connected with the control end of described two the IGBT power models 302 that are connected in parallel by PWM drive circuit 3012 respectively, described touch-screen 3013 is connected with dsp processor respectively with RS485 interface circuit 3014, touch-screen 3013 is in order to show all kinds of parameters of electrical network and device, as voltage, electric current, harmonic current aberration rate, harmonic current content, line voltage, current waveform etc., simultaneously in order to arrange corresponding parameter according to power distribution network present situation, described two IGBT power models 302 that are connected in parallel are connected with contactor 304 by reactor 303 respectively, and reactor 303 is converted to current waveform in order to the voltage waveform that 32 inversions of IGBT power model are produced, described contactor 304 is connected with the main breaker 4 of access electrical network by sub-circuit breaker 313, and described electrolytic capacitor 305 is connected in parallel with two IGBT power models 302 that are connected in parallel respectively, in order to store the required direct current energy of IGBT power model 32 inversions, described resistor 306 is connected in parallel on contactor 304 two ends, in order to the impulse current that suppresses to produce when the first power transmission of the hot bridging type active electric filter device 3 of building blocks is charged to electrolytic capacitor 305, the input side of described isolating transformer 307 is by sub-circuit breaker 313 access electrical networks, and outlet side is connected with the input of DC power supply 308, with thinking that control loop provides power supply, and plays the effect of isolated controlling loop and main circuit, the output of described DC power supply 308 is connected with controller 301 with thinking that control loop provides 24V DC power supply, described IGBT power model 302 is two IGBT power models that are connected in parallel, and the control end of two described IGBT power models 302 that are connected in parallel is connected with controller 301 respectively, described high frequency filter 309 is arranged between contactor 304 and sub-circuit breaker 313, the high frequency ripple producing during in order to 32 inversion of filtering IGBT power model, described ventilation heat abstractor 310 is arranged in ventilation and heat non-resistance passage, and the power line of ventilation heat abstractor 310 is connected with isolating transformer 307 outlet sides by fuse 311, in order to the hot bridging type active electric filter device 3 of building blocks is carried out to high efficiency and heat radiation, described lightning arrester 312 is by sub-circuit breaker 313 access electrical networks, in order to the hot bridging type active electric filter device 301 of building blocks is carried out to overvoltage protection.
Preferably, high frequency filter 309 in Fig. 2 comprises 3 reactors, 3 capacitors and 3 resistors, 3 described reactors are connected on respectively in three-phase electricity circuit, one end Y-connection of 3 described resistors, the other end is connected in three-phase electricity circuit after 3 reactors through 3 described capacitors respectively.
Workflow of the present utility model is as follows: current transformer gathers load-side three-phase current signal, and analog current signal is converted to digital signal, send into dsp processor, dsp processor is according to the current signal collecting, produce pulse-width modulation (PWM) signal, to PWM drive circuit, send driving pulse, PWM drive circuit drives IGBT power model, generation equates with harmonic current, opposite polarity offset current injects electrical network, harmonic current is compensated and offset, initiatively eliminate electric harmonic.
The utility model is in filtering harmonic wave, dsp processor can be according to the current signal detecting, determine reactive power compensation demand, control PWM drive circuit, make IGBT power model output capacitive and perceptual fundamental current, carry out in real time reactive power compensation, the desired value of reactive power compensation can be set by touch-screen.The hot bridging type active electric filter device of building blocks has four kinds of mode of operations to set, and " filtering is preferential ", " idle preferential ", " only filtering harmonic wave ", " only mending idle ", can select corresponding mode of operation according to the concrete condition of low-voltage distribution system.
The utility model can also carry out alternate adjusting to the active power in power distribution network, thereby three-phase imbalance load is carried out to balance correction, and the input of this function can be set by touch-screen.
The utility model adopts ripple cancellation techniques, has two groups of identical IGBT power models, and two groups of identical out put reactors and common DC bus and DC electrolytic condenser form compensating current generator.Two groups of IGBT power models have common current command signal to control, and offset current deferent segment is parallel with one another, therefore in the offset current of two groups of IGBT power model outputs, the effective compensation current component of corresponding command signal is identical, stack mutually after in parallel, exports total offset current for the twice of single group IGBT power model output current; Meanwhile, by controlling the phase place of the modulating pulse of two groups of IGBT power models, make two groups of high frequency ripple component phases in IGBT power model output current intersect 180 °, after stack, cancel out each other, the ripple of total output current significantly reduces.The utility model makes the hot bridging type active electric filter device of building blocks break away from the restriction of ripple current, can adopt the out put reactor of more optimizing to obtain higher offset current tracking velocity, the switching frequency that employing is more optimized effectively reduces the switching loss of semiconductor power device, has improved the operating efficiency of equipment.The utility model can also significantly reduce the ripple current in DC energy storage loop simultaneously, reduces loss and the temperature rise of DC storage capacitor, reliability and the useful life of having improved electrolytic capacitor.
The utility model can adopt the parallel running of the hot bridging type active electric filter device of a plurality of building blocks, can install by wall hanging, also can be positioned in power distribution cabinet, load current detection signal is series connection mutually in the hot bridging type active electric filter device of each building blocks, makes the hot bridging type active electric filter device of all building blocks share same load current detection signal.Between the hot bridging type active electric filter device of each building blocks, by 485 communication interfaces, intercom mutually, realized multi-machine parallel connection.When multi-machine parallel connection moves, the hot bridging type active electric filter device of building blocks adopts master-slave control method, first the hot bridging type active electric filter device of building blocks starting in parallel operation is as the hot bridging type active electric filter device of master control building blocks, be responsible for Parallel Control function, the hot bridging type active electric filter device of other building blocks is done slave.In running, each slave of host computer control adopts the mode of circular flow, avoids the hot bridging type active electric filter device of certain building blocks long-play, improves whole physical life.When the hot bridging type active electric filter device of one of them building blocks breaks down, as long as the hot bridging type active electric filter device of other building blocks is normal, switch the hot bridging type active electric filter device of another one building blocks as main frame, system can continue parallel running, and the reliability of system improves.
When the hot bridging type active electric filter device of building blocks is connected with electrical network, the first closure of connector stroke is a half only, stop action, first completes being connected of the hot bridging type active electric filter device of building blocks main circuit and electrical network, then allows to drop into current transformer signal and start the machine; Otherwise, when the hot bridging type active electric filter device of building blocks departs from electrical network, when connector only also has half closing stroke, stop discharges, first complete and first automatically excise current transformer signal and locking machine startup, then make the hot bridging type active electric filter device of building blocks main circuit depart from electrical network.
The above is preferred implementation of the present utility model; for those skilled in the art; not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection range of the present utility model.

Claims (7)

1. the hot bridging type active electric filter device of building blocks, it is connected with the three-phase alternating current electrical network of load by main breaker, by sample load current carry out filtering harmonic wave of the current signal detecting device of access electrical network, it is characterized in that: the hot bridging type active electric filter device of building blocks adopts hot overlapping mode and the hot bridging type active electric filter device of other same building blocks to carry out a plurality of being connected in parallel, and by RS485 cable, interconnects between the hot bridging type active electric filter device of all building blocks;
The hot bridging type active electric filter device of described building blocks comprises controller, IGBT power model, reactor, contactor, electrolytic capacitor, resistor, isolating transformer, DC power supply and sub-circuit breaker, the signal input part of described controller is connected with the output of current signal detecting device, signal output part is connected with the control end of IGBT power model, described IGBT power model is connected with contactor by reactor, described contactor is connected with the main breaker of access electrical network by sub-circuit breaker, described electrolytic capacitor and IGBT power model are connected in parallel, described resistor is connected in parallel on contactor two ends, the input side of described isolating transformer is by sub-circuit breaker access electrical network, and outlet side is connected with the input of DC power supply, and the output of described DC power supply is connected with controller, described IGBT power model is two IGBT power models that are connected in parallel, and the control end of two described IGBT power models that are connected in parallel is connected with controller respectively.
2. the hot bridging type active electric filter device of a kind of building blocks according to claim 1, is characterized in that: described current signal detecting device comprises current transformer.
3. the hot bridging type active electric filter device of a kind of building blocks according to claim 1, it is characterized in that: described controller comprises main control unit, PWM drive circuit, touch-screen and RS485 interface circuit, described main control unit adopts dsp processor, the signal input part of dsp processor is connected with the output of current signal detecting device, signal output part is connected with the control end of described two the IGBT power models that are connected in parallel by PWM drive circuit respectively, and described touch-screen is connected with dsp processor respectively with RS485 interface circuit.
4. according to the hot bridging type active electric filter device of a kind of building blocks described in claim 1-3 any one, it is characterized in that: the hot bridging type active electric filter device of described building blocks also comprises the high frequency filter being arranged between contactor and sub-circuit breaker, described high frequency filter comprises 3 reactors, 3 capacitors and 3 resistors, 3 described reactors are connected on respectively in three-phase electricity circuit, one end Y-connection of 3 described resistors, the other end is connected in three-phase electricity circuit after 3 reactors through 3 described capacitors respectively.
5. according to the hot bridging type active electric filter device of a kind of building blocks described in claim 1-3 any one, it is characterized in that: the hot bridging type active electric filter device of described building blocks also comprises ventilation heat abstractor, and the power line of described ventilation heat abstractor is connected with isolating transformer outlet side by fuse.
6. according to the hot bridging type active electric filter device of a kind of building blocks described in claim 1-3 any one, it is characterized in that: the hot bridging type active electric filter device of described building blocks also comprises lightning arrester, described lightning arrester is by sub-circuit breaker access electrical network.
7. according to the hot bridging type active electric filter device of a kind of building blocks described in claim 1-3 any one, it is characterized in that: the hot bridging type active electric filter device of described building blocks also comprises connector, and described controller is connected with current signal detecting device by connector.
CN201420314084.1U 2014-06-13 2014-06-13 Building block heat overlap type active electric power filtering device Active CN203911481U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849085A (en) * 2017-03-16 2017-06-13 上海柴德自动化有限公司 A kind of low-voltage active filter cabinet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106849085A (en) * 2017-03-16 2017-06-13 上海柴德自动化有限公司 A kind of low-voltage active filter cabinet

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